Geoege e



(No Model.)

- G. E. HART.

WATCH BALANGB.` No. 352,819. Patented Nov. 16, 1886.

UNITED STATES PATENT OFFICE.

GEORGE E. HART, OF WATERBURY, OONNECTIOUT,'ASSIGNOR TO THE VATERBURY WATCH COMPANY, OF SAME PLACE. i

WATCH-BALANCE.

SPECIFICATION forming part of Letters Patent No. 352,819, dated November 16, 18,86. Application filed July 22, 1886. Serial No. 208,760. (No model.)

To all whom it may concern:

Be it known that I, GEORGE E. HART, of

' Waterbury, in the county of New Haven, and

' ing drawings, in Which- Figure l is a perspective view of the blank from which my balance is made, as cut from a sheet of metal. Fig. 2 is a like view of the same after having one of its faces recessed.

` Fig. 3 is a perspective view of said blank after having passed through the forming-dies. -Fig. 4 is a like view of the same after the iin has been trimmed from around its periphery. Fig. is a perspective view of said blank after the surplus metal has been trimmed from its central portion. Fig.'6 is a like view of the same after having been re-pressed, and Fig. 7 is a perspective view of the completed blank.

Letters ot' like name and kind refer to like parts in each of the figures.

The design of my invention is to increase the accuracy and efficiency, and to lessen the cost of solid balance-wheels for watches; and to this end said invention consists, as a new article of manufacture, in a watch-balance consisting of a rim, central arm, and radial periphral projections, which are formed of or from one piece, and said peripheral projections have plane lower faces and half'round upper faces,substautially as and for the purpose hereina'fter specified.

In the construction of my balance a disk, A, is punched from a sheet of metal. A recess, a, is then cut in one of its faces, and the blank is next subjected to the action of a pair of dies, which operate to form in relief upon the recessed. face the rim c of a balance, and peripheral projections a', that resemble the timing screws of an expansion-balance. The surplus metal or fin is now trimmed from around the periphery of the blank A, and all of the web inside of the rim c is cut away, except such as is necessary for forming the central arm, a2, after which said blank is re-pressed within suitable dics, so as to give to each part a perfect form andto give to the metal the desired density. The final operation consists in trimming from the edges of the blank A any fin which may have been produced by the re-pressing, after which said blank is ready for mounting upon its staff.

The balance-wheel thus produced is perfect in shape, except that its peripheralV projections c are but hal f-round. Its density largely exceeds that of any metal ordinarily used for such purpose, so that there is less expansion and contraction under variations in temperature than in solid balances of usual construction, and its cost is but a fraction of the. cost of ordinary solid balances. k,

Having thus described my invention, what I claim is- As a new article of manufacture, a Watchbalance consisting of a rim, central arm, and radial peripheral projections, which are formed of or from one piece, and said peripheral projections have plane lower faces and half-round upper faces, substantiallyas and for the purpose specified.

In testimony that I claim the foregoing I have hereunto set my hand this 18th day of 75 May, A. D. 1886.

GEORGEE. HART.

Witnesses: f

GEO.` S. PEINDLE, HENRY C. HAZARD. 

